Get them off amazon....
[ame="http://www.amazon.co.uk/Osram-64193NBP-Night-Breaker-Headlight/dp/B003Y7FKTC/ref=sr_1_1?ie=UTF8&qid=1362344933&sr=8-1"]Osram 64193NBP H4 Night Breaker Plus Headlight Bulb 12 V 60/55 W (Twin Pack): Amazon.co.uk: Car & Motorbike@@AMEPARAM@@http://ecx.images-amazon.com/images/I/41H9WkAtx0L.@@AMEPARAM@@41H9WkAtx0L[/ame]
£10.95
(where mine came from)
The headlight is a bit whiter but not much better than standard However the Main beam is amazing!